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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12665112 B1

PDFFull Text
Date of Patent:
Jun. 23, 2026

Filed:

Apr. 06, 2022

Grain-oriented electrical steel sheet and method for forming insulating coating

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Kazutoshi Takeda, Tokyo, JP;

Takashi Kataoka, Tokyo, JP;

Shinsuke Takatani, Tokyo, JP;

Yuuki Kogakura, Tokyo, JP;

Yuki Kunita, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Megha M Gaitonde

Int. Cl.
CPC ...
H01F 1/147 (2006.01); C21D 1/74 (2006.01); C21D 6/00 (2006.01); C21D 8/1216 (2026.01); C21D 8/1244 (2026.01); C21D 8/1277 (2026.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C23C 24/10 (2006.01); C23C 26/00 (2006.01); C23C 28/04 (2006.01);
U.S. Cl.
CPC ...
H01F 1/14783 (2013.01); C21D 1/74 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/1222 (2013.01); C21D 8/1255 (2013.01); C21D 8/1261 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C21D 8/1288 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 24/10 (2013.01); C23C 26/00 (2013.01); C23C 28/04 (2013.01); C21D 2201/05 (2013.01); C22C 2202/02 (2013.01);
Abstract

This grain-oriented electrical steel sheet includes: a base steel sheet; and an insulating coating formed on a surface of the base steel sheet, in which the insulating coating includes an intermediate layer formed on a base steel sheet side and containing a crystalline metal phosphate, and a tension coating layer formed on a surface side of the insulating coating, the surface of the base steel sheet has an etch pit structure, an average thickness of the intermediate layer is 0.2 to 10.0 μm, an average thickness of the insulating coating is 2.0 to 10.0 μm, the tension coating layer contains a metal phosphate and silica, and an amount of the silica in the tension coating layer is 20 to 60 mass %.

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